Problem reading original EPROM

[Programmer]

Steve,
Download TunerCats' "Checksum" program. Read your chip with your EPROM
burner and save the file. Read the program with the ChkSum program--note if
the checksum is correct, and you've more than likely got a good read on the
thing. Use NAT 27C128 and do a read and save, and then 27C256 settings if
that doesn't work.
I tend to save files with the chip size extensions so I don't get mixed up
<g>.
Lyndon.
-----Original Message-----
From: Marteney, Steven J. <smarteney at xlvision.com>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: May 8, 2000 1:19 PM
Subject: RE: Problem reading original EPROM


>Nope.  This is straight from a Needham's PC EPROM programmer.  Anyone out
>there reading OEM chips?  According to the ECMguy's site, location $0008
>should read $6E for an 89 165 F-body 350TPI.  My internal buffer after
>reading the PROM verifies that, but, like I said, the checksum is different
>everytime.
>
>Help is greatly appreciated.  My guess is maybe this is a slow EPROM and
I'm
>commanding the reader to read it too fast, but I don't know.
>Steve
>
>
> -----Original Message-----
> From: Patrick G. Moore [mailto:pmoore at cmr.gov]
> Sent: Monday, May 08, 2000 2:40 PM
> To: gmecm at diy-efi.org
> Subject: Re: Problem reading original EPROM
>
> "Marteney, Steven J." wrote:
> >
> > Do these things have a security bit?  I tried to read the
>original EPROM for
> > my 165 ECM (89 F-body 350 TPI) and the programmer keeps
>giving different
> > checksums every time I check it.  The code is APYU3516.
>What should the
> > programmer be configured for?  The chip doesn't have a
>recognizable part
> > number (LAE8824).  ECMGuy's page says it is a 27C128.
>What am I doing
> > wrong?  Any hints?
> >
> > Thanks in advance,
> > Steve Marteney
> Hi,
>
> Are you using the pocket programmer?  I had some trouble at
>first reading
> my eprom.  You must make sure you don't have the chip in
>there before
> you initialize it from the PC.  It would look like it read
>fine, but it
> would not verify, until I carefully followed the
>instructions.
>
> HTH
> Pat
>
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